That’s just HTML to change that one video though isn’t it? And I’ve no idea where to enter it.
I’d like to change the box size to allow any video I post on a blog page to appear at 720px wide.
Is there some CSS I can add to the ‘Quick CSS’ box?

This is the problem. I’ve uploaded a photo into the post’s gallery like you said using the green button, but there’s still nothing showing on the preview on the main blog list or inside the post.

I’ve tried using each of the 6 options under the ‘Gallery Layout’ tab but none of them do anything except WordPress Default Gallery which just adds a tiny thumbnail into the post, but nothing on the main blog list.

The only way I can get an image full size inside the post is to add it under the text using the Add Media. There is no way I can get the image to show on the main blog list regardless of how I upload it.

Basically if you go to the Blog page you’ll see that the text is all one paragraph. When I wrote it I used line breaks (shift + enter) and double spacing (enter) to break the text up to make it easier to read (like I’ve done in this reply).

However, this hasn’t worked on the blog post. None of the breaks/paragraphs work, either HTML or shortcodes.

If I add a long post in the future it will be difficult to read.

Regarding the permalink question – on your demo page blog you see multiple posts. When you click the title of one of the posts it opens it in it’s own separate page with a comments section.

On my page if you click the title it just links back to the home page. There doesn’t seem to be anywhere to add comments etc.